Can't pass level 20? It's locked and I can't figure out how to continue on the map.

Trish_Ariss

In farm heros super saga I don't know why it won't let me carry on in the map. What do I have to do to continue. 

StuckInATree

To go up the saga you need to tap and hold on the top of your screen and swipe down, you should see the rest of the levels appear over the hills after that.